Rotary pump



(No Model.)

V. P. CARPENTER. ROTARY PUMP.

1 No. 436,399. Patented Sept. 16, 1890.

UNITED STATES PATENT OFFICE.

VARNUM F. CARPENTER, OF CLEVELAND, OHIO.

ROTARY PU M P.

SFECIFICATION forming part of Letters Patent No. 436,399, datedSeptember 16, 1890.

Applioation filed October 24, 1889 Serial No. 328,092. (No model.)

To It whom it may concern:

Be itknown that I, VARNUM F. CARPENTER, j

a citizen of the United States, residing at Cleveland, in the county ofOuyahoga and.

State of Ohio, have invented certain new and useful Improvements inRotary Machines5l chine with the first top roller, seen in Fig. 2, I

and the central bearing cylinder 01' roller removed, the view being inthe direction of arrow in Fig. 2. Fig. 2 is a crosssection of themachine, disclosing the relative positions of the parts as in action.

A is the casing or shell of the machine, having induction-port 0t andeduction-port a at opposite sides. This casing has no special featuresor .novelty alone, and has a plain cylindrical interior and heads orends provided with bearings for the shaft and bolted or otherwisesecured to the body part in any well-known way. The inner surface of thecylinder is turned off so as to be perfectly true and smooth.

B is the shaft which extends longitudinally through the cylinder andopenings in the heads thereof at one side of the axial center of thecylinder, so as to give the eccentric bearing to the piston carrier Onecessary to make the invention operative. The line of the shaft, ashere shown, is below the center .of a horizontal line traversing theaxis of the cylinder, so as to bring the carrier down in the lowerportion of the cylinder and make the upper the operative part of thecylinder. The carrier 0 is fixed rigidly upon the shaft 13, and has itsperiphery concentric with this shaft as its axial center. Incross-section the carrier is sufficiently smaller than the interiordiameter of the cylinder to give the req- Ordinarily the difier- Thecarrier consists, primarily, of spider- I like supports or ends c,fastened to the shaftsay, about one-fourth the length of the cylinderfrom its ends-as seen in Fig. 1, and in these supports are threecorresponding substantially semicircular bearings 0, arranged at equaldistances apart around the carrier and opening at the periphery to giveoutward and inward play to the cylindrical pistons D. The pistons D areplainsmooth cylinders extending the full length of the inside of thepiston and adapted to fit and occupy the semicircular bearings in thecarrier. Intermediate of the said pistons D on the periphery of thecarrier and concentric with its axis are segmental plates E, which arefastened to the ends 0 by overreaching flanges 6 along the edges of thesaid plates bearing against the inner sides of the semicircular bearinga at the outer extremities thereof. The sides of the bearings c, withthe flanges e at either side, are just far enough apart to give thenecessary freedom of in-and-out movement to the pistons D to operate asdesigned, yet making the lines of contact, whether the piston be in orout, practically airtight. The flanges e extend far or deep enough intothe bearings c to lie against the sides of the cylinders D when saidcylinders rest in the bottom 'of the bearings c, as seen in the lowercylinder, Fig. 2, thus preventing air from escaping by said cylinders totheir rear and confining it to its proper channel. The periphery of thecarrier when the cylindrical pistons are in position is in this way apractically-continuous air-tight surface, notwithstanding that thepistons work back and forth therein. The plates E of course extend thefull length of the cylinder, like the pistons to which they are adapted,thus overreaching the ends 0 to about, the extent shown in Fig. 1.

With the usual speed at which a machine of this special. character canbe driven advantageously the pistons D would probably keep their workingpositions without other means to effect this end, the centrifugaltendency being sufficient to hold them against the cylinder and rollthem along over its smooth surface. However, to. avoid any possibledefect in this particular, I introduce pressure-rollers F into thecylinder over the axle and between the ends of the carrier and the headsof the cylinder. These rollers or tubes are like cross-sections of thepistons D, and of a size which will bear equally against each of thesaid pistons and keep them constantly against the side of the cylinder.Hence when the carrier is revolved the pistons bearing upon the side ofthe cylinder are caused to rotate, and this rotates the idler-roller F,

and all the rolling parts move together.

The cylinders for convenience of description may be numbered 12 3. InFig. 2 cylinder 1 is just approaching the induction- 1 port, and 2 issweeping around in front and sucking air into the deep air-space behindit. As soon as 1 passes the induction-port it is in position to forceforward the air in this space to the eduction-port, and the space behindit will be filled with air in turn. By that time piston 3 will have comeup into working position, and so on continuously. In Fig. 2 piston 3 haspassed the active point and retired into the bearing by reason of itsposition in the system, and this forces roller F against the two otherpistons and holds them out, as shown. In like positions in rotation thesame thing occurs with each successive piston, and meantime the roller Fholds its place in the center of the cylinder.

Obviously the machine herein shown and described is not limited in useto an airblower or to compress air, but may be used as a rotary engineor a rotary pump for water or other fluid, gas, or the like. Theposition of the cylinder is not material; but for convenience ofdescription certain parts have been denominated upper and lower.

Ordinarily the machine will occupy the position as shown in thedrawings.

A machine constructed on this principle has the advantage of easymovement with high efiiciency, the pistons working practically Withoutfriction and rolling along over the surface of the cylinder while theymove gradually back and forth in their bearings. The

pistons are described as being of metal; but they may be made of wood orany other suitable material.

It will be observed that the pistons and the rollers are of exactly thesame size in cross section, so that they revolve together, while at thesame time the pistons bear against and turn on the side of the cylinder.Thus the pistons have two rolling contacts.

Having thus described myinvention,what I claim as new, and desire tosecure by Letters Patent, is

1. The main casing, a piston-carrier set eccentrically to the axis ofsaid casing and having circular bearings for the pistons, in combinationwith circular pistons in said bearings, and a free cylindrical rollerbetween said pistons and forming a revolving bearing by which thepistons are kept out in contact with the casing, substantially asdescribed.

2. A cylindrical casing, a shaft at one side of the axis of the casing,and a piston-carrier with circular bearings on said axle, in combinationwith cylindrical pistons supported in said carrier and inflexiblerollers bearing said pistons outward against the casing, sub--stantially as described.

3. The cylindrical main casing and a piston-carrier eccentric to theaxis of the casing and extending from end to end thereof, in combinationwith cylindrical pistons supported in said carrier, and two stiff orinflexible rollers, one at each end of the said carrier and arrangedbetween the said pistons and bearing against the same, substantially asdescribed.

4. The main casing having a cylindrical interior and a carrier for thepistons having ends 0 set in away from the ends of the cas ing, andsegmental plates E on said ends extending the full length of theinterior of the casing, in combination with cylindrical pistons, androllers F for the pistons between the ends of the casing and the ends 0of the carrier, substantially as described.

5. The cylindrical casing and the carrier set eccentrically in thecasing, in combination with the cylindrical pistons, and rollers of thesame dimensions as said pistons in cross-section and bearing againstsaid pistons, substantially as described.

VARNUM F. CARPENTER. YVitnesses:

H. T. FISHER, NELLIE L. MCLANE.

